huggingface config_error ai_generated true

ValueError: special tokens not properly configured

ID: huggingface/tokenizer-special-tokens

Also available as: JSON · Markdown
82%Fix Rate
86%Confidence
3Evidence
2023-01-01First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
4 active — — —

Root Cause

Tokenizer missing pad_token or other special tokens.

generic

Workarounds

  1. 92% success Set pad_token to eos_token: tokenizer.pad_token = tokenizer.eos_token
  2. 88% success Add special tokens: tokenizer.add_special_tokens({"pad_token":"[PAD]"})

Dead Ends

Common approaches that don't work:

  1. Set pad_token to random string 82% fail

    Wrong token ID, garbage padding

  2. Ignore padding entirely 78% fail

    Variable length batches fail